Perhaps you should try some spelling variations:
mitigation techniques » imputation techniques
indication technique » inhalation technique, reduction technique, truncation technique
no2 mitigation » _ mitigation, error mitigation
based novel » based anodes
based no2 » based co, based n

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (( learning-based no2 mitigation techniques ) or ( learning-based novel indication technique ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( learning-based no2 mitigation techniques ) OR ( learning-based novel indication technique )).
• Adding a wildcard symbol may retrieve word variants: (( learning-based no2 mitigation techniques ) or ( learning-based novel indication technique ))*.